THE INDIAN PUBLIC SCHOOL
REVISION -1- BATCH -3- REVISION WORKSHEET
TOPIC-OUR ENVIRONMENT ( HOME WORK)
1. Why flow of energy is always unidirectional?
2. What is 10% law?
3. Why food chain should have three or four level only?
4. Define Biological magnification.
5. List any two man-made ecosystem.
6. Why aquarium need to be cleaned at regular interval?
7. Differentiate between biodegradable and non-biodegradable substances. Cite examples.
8. In the following food chain, 20000KJ of energy is available to the lion. How much energywas available
to the producer?
Plants deer Lion
9. Observe the flowchart and answer the following questions
A B C D
A.Write any two food chains from the web above.
B. Which of the food chains are advantageous in terms of energy?
10. In a food chain, the first trophic level is always occupied by
(a) carnivores (b) herbivores (c) decomposers (d) producers
11. In 1987, an agreement was formulated by the United Nations Environment Programme
(UNEP) to freeze the production of “X” to prevent the depletion of “Y”. “X” and “Y”
respectively referred to here are:
a) Ozone; CFCs b) CFCs; rays UV
c) CFCs; Ozone d) UV rays; Diatomic oxygen
TOPIC-HEREDITY
1. When Mendel crossed a Tall plant with a dwarf plant, no medium height plants were obtained in F1
generation. Why?
2. "The sex of the children is determined by the what they inherit from their father and not
from the mother." Justify.
3. Only advantageous variations help in the evolution of an organism giving rise to a new
species. Explain with the help of an example.
4. How traits are independently expressed?
5. How traits gets expressed?
6. Male parents always bare red flowers, Female parent always had white flowers, 330 seeds sown and
observed, all 330 gave red flowers, out of 44 seeds 33 seeds gave plants with red flowers and 11 seeds
gave plants with white flowers.
(i) What is the term for this type of cross?
(ii) Mention the phenotype of F1 generation.
(iii) Express the gene type of the (a) Parents (b) F1 generation (c) F2 generation.
(iv) What is the percentage of tall plant to dwarf plant in F2 generation.
7. Pragya performed an experiment to study inheritance pattern of genes. He crossed tall pea plants (TT)
with short pea plants (tt) and obtained all tall plants in F1 generation.
a) What will be the set of genes present in F1 generation?
b) Give reason why only tall plants are observed in F1 progeny.
c) When F1 plants were self pollinated, a total of 800 plants produced. How many of these would be tall,
medium height or short plants? Give the genotype of F2 generation.
8. In pea plants, yellow seeds are dominant to green seeds. If a heterozygous yellow-seeded plant is
crossed with a green-seeded plant, what ratio of yellow and green-seeded plants would you expect in the
F1 generation?
(a) 9:1 (b) 3:1 (c) 1:3 (d) 50:50
9. A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea
plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short.
This suggests that the genetic make-up of the tall parent can be depicted as
(a) TTWW (b) TTww (c) TtWW (d) TtWw
10. An individual inherits different traits from his parents. On what basis classification of traits as dominant
and recessive is done?
